Pretty sure this is Pandani (Richea pandanifolia) but cannot find the species listed in Nature Mapr.
From TAS PWS - https://parks.tas.gov.au/discovery-and-learning/plants/pandani
Pandani
The pandani is the world’s tallest heath plant and a distinctive example of Tasmania's endemic plants. Found only in Tasmania's alpine areas and wet forest mountains, the pandani can range in size from a small shrub up to a 12 metre tree. Its tough, serrated leaves can be up to 1 metre in length. Its unusual appearance can make you feel like you have stepped onto another planet.
Common name: Pandani
Scientific name: Richea pandanifolia
From the Australian Native Plants Society:
Richea pandanifolia is a tall palm-like species which grows from 2 to 12 metres high. It usually grows on a single stem but may be occasionally branched. It has tapering leaves which may be 0.3 to 1.5 metres long and, like all richeas, they have “sheathing” bases…ie, the base of the leaf wraps completely around the stem. The leaves are densely crowded towards the top of the trunk. The white or deep pink flowers occur on panicles (a branched inflorescence) up to 25 cm long in late spring and summer. They arise from the leaf axils and are often hidden among the leaves. The flowers are covered by large bracts which fall as the flowers develop.
https://anpsa.org.au/plant_profiles/richea-pandanifolia/